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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ec034866befe814fcd80c09905a31618c4a7b86c5330568cfaeefaf05e5a8' 
  AND token = 'wMXTQBB0UJZxVIES1ouAVodF4U6suFtjvG5DgJaUuA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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