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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd73b6e7b9f0ecd9027ec5443cce4ba34c276b2afeb426251a892724e96d357f' 
  AND token = 'PqHEvm5A7I5FVlsYqnpBVo0mtMD0vKT9GbhOYrfqnxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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