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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55370c2794395b8169e7283682a65731773872600d8bbb607f2b17604cb85997' 
  AND token = 'ck5IADjG4Us6HTEqUOxW6bgQR51lprRrMb73QG9eaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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