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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760085bfc6bce5721dc12de293e13e6a4641fbb5093c8970388c19f3df7fe591' 
  AND token = 'SS9YdGUVGaIseiKvtjIKjhGKZcDK3U26uSJfNyRF/NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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