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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611466c615931b95b63f6cd7965fe3680e48bb589ae6dc804bce2f706e27bc87' 
  AND token = 'cC+8vgG6OGEGxS4reV+GFvdxghKV663DnhtI+YmeAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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