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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163e7679db9b81a1a7b0e968723b152c0209b6f5b9cbb412adae46a3b87fa3f3' 
  AND token = 'Mq2yVlRIP1Fge4+BNnxHt91uTkSiK7rSQRSlyRzKFKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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