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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b9035edc5c9f273e8fe9e039b18652d3b30e6ebd711b8720dbbe79b71a2b52' 
  AND token = 'inFz4CyGe7BALQGcN5UPJtt5WninMNDV8A7ZsBTKe2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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