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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4f8307ea85fc5e4996b8705dcf8d820643e86fa52142bfa466a8aa0e383acb' 
  AND token = 'N1IzbHq66GuDERK01b7jZdoKZ6xTPvfvNinK3LF5ydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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