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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8397d86d40164d43417eab51824811a444f4ddd88c65fc46711ea5df9aacea31' 
  AND token = 'Mfp3KXpwqamRIsmDSheNazXOzSeDdNzwi4y3v24TbVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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