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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3460d4f1fe53a439b56d928ca9678263ca8a1c0810b1b959b84e6071e17767' 
  AND token = 'TNzlV5fY3Sdvk2VIbvKrTrkX72+CQAtRRt8UmbzURSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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