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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a832953fdfe0a00a06c2a28744da2dd3b8350c2eea3f54c55b5a8901899be22' 
  AND token = 'N7M5eKcHlf/ljzLlkTEb1BuuGt8vnX3CnzXh5dZ4kqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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