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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d66347c6fc890ee55763ef2e2f3f0ba2e630039e7834f0afabd765fc1aaa06' 
  AND token = 'NcatwipyaJ2kozY/KaCEwUvWChLjDg9Z11L5DeAzlD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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