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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b472fd6a03b530e88718c8c308068d9f71b802c799f7275338e340d3e56dd07' 
  AND token = 'LfXaseE00tt+TdKVIEym6tmQAjDKj/ryeJiKo6LswJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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