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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ebffaff57e2224af83a30e23b8a505718d88d1eb439c7bcc489b3261840ab5' 
  AND token = 'UXHCfKYtO7Q9+H5giIdRXOY0azu+MI/cttdEYM0X858=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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