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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1114cd6f160be2c60ad07e004416ded4db20bd8e2549b91841d3b37d60439e' 
  AND token = '15yf5XPlUWbXhI6y5pAu6GiA84XzvU28dDIotKcx1Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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