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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8589cf9af6417c6780def0e45e8f828060e97ee0285c257588d66dc76e30264d' 
  AND token = 'ibmdN3A2zgN1qvLM4vgk9KOarRwokP9sVs/Fe1dDNvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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