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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d476e1de2deb073ebdf5ebadad00edbea59981d9a2ae50e38d860335199b38' 
  AND token = 'LrkXz6RTt7r65UvrHUTvRC1/kFVEas2koG2/SflYhqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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