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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcbf0d2919562de3a7ffe9f631078fad14eb1a16a830dcde377b83b3f75c7c9' 
  AND token = 'WMdeXnTaEl9F9ajKSSrPGRk8TwO6Aq8bQ0rUn8u7HVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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