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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f40addf3f4764a5d4ff9a697fae9b666e08e2e35f6c60bbc553410d84a89ee' 
  AND token = 'lGGvEs5q1XePXTq7dr3MYc0ZV2jhX3rzWGURB/cDF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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