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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beab0678010bedd717655a6d5ad1559ef9eb2f96bdb6495a29203cd036a61b19' 
  AND token = 'f2WaQeV2eU70qwEz2cpFuxo68brrTOVXZYi3dpyjh/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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