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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed19b9de41027403151608b52d4d4f1b3262cf73a348af9729d162475ed7cf' 
  AND token = 'Q5QQNbgTfPZHXO3so1n2BXYOE50qN1uUGMHHcNjiYGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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