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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cc6f2012a6116ee55f17103840eba389e8233634d3ef81c0bb703709ef03bc' 
  AND token = '0fJvrNVUIwYX5I/zXlfj7CnKQ5ciTP0w/GS5xwdlB3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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