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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72356dcccf8aa5d210617d8c1d6a84e250d5421b58fa4a11c3c44e5e19fd8484' 
  AND token = 'Lu6s0LZiwJqJS2iaxmTSZy5mqayJRmMm9RfaXFepXms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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