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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8f44de90d2c7ebf8646015075ff0ea86d4e996cfbc60105561e1e69ab0eedf' 
  AND token = 'phrirmTQhKj3KTzNVDLfur5+qY4l09SVaYd/J4dSBsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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