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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effebb015b280ba820b8ad9d69636015222ee3ca0df19acf2642bd60590e6405' 
  AND token = 'wh2XzTOF/7ep3uaBQyEBzeBd3/4zH92OuYkBpbm/ots=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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