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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b15f3acaacefd231b136121520c2065593ae91642d350f5306d2400ed75d67' 
  AND token = 'onmWVA5XGdHEx5+X5nFjv0YQ8usWECAGDqaYtnGly7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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