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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd66e98a65939fe92e2e98a7eed7d28e36f635cd3b126040937507eedbf22af' 
  AND token = 'qf45IC5WgKTWvr7uu5k/67r5nKnm/uzV3VwXpv++agE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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