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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf0837174d4d8fdc8ed33cca0b81121117c381adf8b12e591c60f290a74ce46' 
  AND token = '1Y0t/Ryoa2dkLk9Unt3auHwv4FNP2wUsI2n0TYbJyuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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