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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce129b920d5b0f685cb91d1d032d3b7fafab32bfc9320b080ba00ea0d4c002f' 
  AND token = 'xef5lKogA25fBVoTO63xO9dRoyL94jCvXchBDA46vyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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