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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb28d707f164eac7cc5039093f450c191a7a372b0ee8e0dd03573a6ed594a7d' 
  AND token = 'tgmDgm/qBiKpsYCLMfGYyMa1/iep+haT//Ior6AKgGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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