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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf73ce8e38ade4f31e2f78355a2c932a2ca0a9440ab5b8c74f411ac3feba957' 
  AND token = '9KBYayTc/fIoy5UxJYvL9i3CB47YodUZD+KOMHi7dL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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