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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78064c554071d1bf1e9b9aa006414750d3bed14d4b0ac873b0448fbbb4bea456' 
  AND token = '8ZUTUwXS88bhbQy5N1RPP58AkICKF55UtIsMzbLpIbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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