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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cf5ddc9c4e7fc6fbb5e28cc4e874eac474d32acc1d6870ac1a007a51ed1872' 
  AND token = '1uA4cnUtUGkzv83kBvMOYt58s3HQsmHGz/y4l4TXnRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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