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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b908e648d1aca21c7e1351f6d2fa1b71665cee8ca10605667906f09a75d69ef2' 
  AND token = 'zNCO9CsLSPr8g2fz01ahEXfY/ILkOFH41nPoBBcoals=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}