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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e0e6e23e01a3cde44b25c15885a1d36fe9d2c31e29289e72c5f04a67a1e614' 
  AND token = 'zmlihAujj+XHApJIXd4c6hnt+e/7oy13J09YvlJtaXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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