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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ac90744153d501a6b1a255d90b86bacf5bfe6f8b2fc4b867f3f7560a160bba' 
  AND token = 'nCT+l+5yDL90QNwE6orS7CpERNZevunV4IyupPebEFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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