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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492bf54fabc30bd72971b9b17d726fcfa13fea920767b54bef94df774edd0ffb' 
  AND token = '3Dh5MRJbQqmQZ6QGPhA21WwbWR3bNZYm7zZx/tDjG/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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