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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c1e33b9827985a1313d7b896135f05db583b113bb56dee1b8eef73922097ed' 
  AND token = 'DKAD1UEbhbyS9/Qzm8VVq1txQweboBP85Bn9k7Sytj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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