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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3083c7f91d1cc1d220fcaad95cd8b6fbda93b966c35be81706ad80c014b74b7e' 
  AND token = 'L+GA9XUbFkEi9RtY+lcKojsxGX67IwJt4pe5TqQj9zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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