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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a958cfa7023a0feb463209dcb6da9668f8434bd0459604f923d602a11826e017' 
  AND token = '9+wiRmIJP2syQuWZ/mJ8X5NDe3nol5YAgae6UxF3YVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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