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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c702aa816707c0b2957eee5b7c89e88bfd6eb3b03df10ed13ce95b3e168fea54' 
  AND token = 'kl4YvaS1WZrxQPa3KsP4KjrsMpXSAs9CbQBUY2pnce8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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