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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95494c9e39aa37a2cf45c6b5d2de06fb2aa19d16ddddba06f7dea46d2d26fdf' 
  AND token = 'BlpUt9aycJlzu66OKJOZEtu5pDf9b6p8j9Wddq3zaz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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