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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e18c68aa4d774ac17f1766ae77c8c8c56732cbf481759de7719f869332b9dc5' 
  AND token = 'ejpFm7WlOzVIRHYaJ5iLJuO8qQ7/xriaeA9ibuPi1/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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