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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8f81e4d0b55f3128de805f76c9b4d7352facfe15cc2973f4213ebf5fc92e1d' 
  AND token = 'oUA3SfD7TSaBVVnRY1ziPBwt7x35XTA+sUhJUeYUojY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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