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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c0157486077c646efa7f48a9711a507547a765c346e2411b849914520ec2b6' 
  AND token = 'jOwZK+ikQJ3/PaDVZF5TM4dLcxc4XA59H0JoHQ1ua4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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