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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f4ebc70c1dd603877216fa46d75b8af91effe245b8e5bc341d8c4e100fcdf' 
  AND token = 'xRqCmETyqoXm5DOnht5BxaUfIkrTXVYgUZv+jOAaMNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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