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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1310adb5a810b02613c81498481ab743b87c4c49c5c4680b540ac0eb8d2b3ee1' 
  AND token = '3X2ITrg5k8qb1jD8kK4mE71g/d45M7LF1yCTJWTJM78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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