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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c656ccdcec327c191c4d3e2504a6da8f98a65ce809e2cece3a31afc763e75427' 
  AND token = 'WQ5CPz8pPBBoOzgZeRw5oajdWIsRinHx4VZ1m5HXG0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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