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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515eb23c20db9fe596cb46ea1a5e13aba842462fdd91b7a93cbf3a79c8bbd58f' 
  AND token = 'H+Ueal1yHPLHx2T+siffHREHvZolWycQg/665GH2nHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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