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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab70d52f7b07c48f6a2b1b83ace6c0c48958fe13d0469548bdcc8f7b7894ba2' 
  AND token = '0wU+ZPwl9zxadKSpAljEaXTPKAhLZav5gbxiRXzEu6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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