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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e57d3b8db78bb652164c22d62aa53a9fcfd7ab33a8cec6e9df8fbfbd5fcdcba' 
  AND token = 'xVK7puVMG+HF57uYiv7FOmtcKb+DrusaQJZknHfQb70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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