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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3aaca8cecfd0490aa4f18aab253342a9a9945eba4e5521c7e012468ec9b6287' 
  AND token = 'Wb1KI4M5pfFBZjFw3sz23tSwmuEK6MJxAt3vOTw6T40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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