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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca92625f1d83661f18581340133111ab393205a394147e86b893a7465c468545' 
  AND token = 'x1J15XTepLSQ6/UlsDmyGKFIRyiBi126v3eMk4BPIOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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