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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca784986072646304777635e6af45a11c3b828a94e8d1919d36f4f4d6c3da6ca' 
  AND token = 'nNaJhu0UckD/CdDhymTNi5VXTm0WX1/pOBO9BjD3QtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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