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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcdecf72cc94bdb79a8303e895350b849e0c45541d49d98dc7bf2d08f4ba60d' 
  AND token = '0Vdv/Qf/Qyz5iN7ckokOFJ4vnXEJ7yGSFVUXIgpvoV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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