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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f411a56d118ddab11efacea15f67bf4e1b93e2f44cfbad28d9a1f29ba974f73d' 
  AND token = 'RNawFQqUxIeyluhC8lNrcaxQa8voV5dL/Zd9gWxSIrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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