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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d6e9373765ca5624ac793e23efba224a8c2bc7f02b495222fada5923895a35' 
  AND token = '1b9sP7BWG4Ov8nPmL79sh186YfWQh2Kio25u83LvWaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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