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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b967d77f30b9c4f9a40cf18ac52342b6c732a323d86d292853e135d2843cc6' 
  AND token = 'qlO3gTaAnTXrFfM5KcrAF9kzGVr0YjhppaH3byStoMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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