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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fff1e1d58fe242554a8bc728956825f4edddb8b35911ee686e2a74a6fd1f94b' 
  AND token = 'YbYTf89Ylz+YP4J3vijvuBYny/dpo1MLtlU2PaBvsh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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