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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028cfae40654fa13fc30ea1fded37d0d8a83f9c7a28a38bea173bb4538c6c890' 
  AND token = 'DWbtQLyxCdaMSQTcD97Qu9bm9p2SrApNoXTY9um4qD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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