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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cff12a0701becf688d36d45d63e82475eb1cad90bdb7ac1ee41774cbb0515ec' 
  AND token = 'QJmTylutH0BXIS1FqFdYm/ACszXorcsjk+AkprVDeUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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