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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac27596ad995a8068f35789c8998c609f0ab8acd7b7f7c9e1f072d2d6c04a5ce' 
  AND token = '13c21jo44Nl5bYsbh2J81jIPzQ1mW/lSvCbaNN2TA1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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