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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa038adf0129353c8b3b0949eca52f7348326d5a926b1dfff6e3727a84248cd' 
  AND token = 'rai3lhmtOJiCMXg8l2Y8D07JdpJXQAI3FB1tVrPlE6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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