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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aaa88b75728c6bf6d00585f2c090f334e1dbe141a45e919cebcd498c44a83cf' 
  AND token = '6DDz8iZnmC6dLOv9FCOlYkYeTt5VMcyy9/gAnQCnVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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