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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811eeaa35d49ac08c49d5fc3bc4e75314e5f3e728401ab580a55f70aabecb855' 
  AND token = 'iceEgF0T8qnjwCKacJCFfRo4cD9/L+y6nPba67WWaQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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