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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7593b7bd4bef9e0d6f673e33cec2b3bafddf0894e8cc71ed973d213569c52b12' 
  AND token = '1e7RzlcyvjRV3MBoyCtYBrbdeuGcXivt75+XwkE7UJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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