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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652d35dedd87bdec57720c759999d952346339d6fdc78d9a54cf724a7f15455b' 
  AND token = 'qARtBooYadwgLE2S0uFU3LVTlc7++/k7Ii/3t55x5uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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