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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f54dd577f2c754d4bcb9f916c769d3063a409b07c9eaa3c885b3585b0b6396' 
  AND token = 'RpFBALn9dIm1KbNJSEujNMaQ+W6SeaDrboDKDszDCZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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