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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca937c3faeb63ecfe2b98e80ae44b5e256b3e2b2c4a05073292418effed6a49' 
  AND token = 'lLuxzIaFy9qHOavs+K7alFhptu74tAGJ723hxfKnqm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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