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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0a495d0bcb2c861499429736cb1a8b50425901aee37f167925eb4d9fa10ccd' 
  AND token = 'Dr/Oz7FS3PiORprOFrq3hJ5oVhEsPWlO/n/P7dJEf5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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