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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d0b77e36abbc9f9a84e1b12fd2438bc10328197ca52abbfe31b9c42d4444aa' 
  AND token = '3g6FnkLiyx2O1rPvBV+0WUy2Jr1lOpKXYoevU/spCFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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