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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1e45c383036aad55d7373cfe39f6cd0b6f839aa9a8c825878e99d97ec1cf7e' 
  AND token = '0suVNGmsWDqMIxfVWOttB9a4NTthpaGIZdMET4pOGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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