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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf720cad49099284758c1cbc765c953f3dbee4ac7d59a637abcdb03e855801f' 
  AND token = '5fWLbrgTXT3hBkz+VhHA9ZJhv8cFbfi5kiA/pdE0N9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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