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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9bf73159093c9e3c857a5829bd1861184a1b4d7fb6d3e8747eb4778e8d2a96' 
  AND token = 'odEnG4W6M4SHhaj5U6HoUT9pcRioeAVxZq4pgO/BkoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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