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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8c37082ee71d8fa96ba482b0c83eb8523ea6402c19a0817b87faf2fa3055b4' 
  AND token = 'cUsq0FkaALXNBGV2rxPJkRdUSgO3RyTd5Cpo9c1FTCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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