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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6aa2ead820407ac8f1675a17d6903dae0cad038929bdae3d2e4f5b1185e848' 
  AND token = 't4aJU138/bw6IU5ikk7aETflwpk8D0fEYrAZyOYxQFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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