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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f06d09cca70ff00ad1f1d367d9b3e8ac2c977988264262b6dd7b4bb0c3e5f33' 
  AND token = 'IlYvy29hG9W6YQraCO5H/NbT8bRyO8YZChqi4iOUJ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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